toggle between paypal button/credit card payments

[cakePlease]

I have s2Member pro and a paypal pro account, and have installed the form shortcodes for the 2 forms that i needed. The forms allow for all the credit card payment methods that is standard, and im assuming they work...have not tested yet.

But my question is, i also want to allow paypal payments (not CC payment) where the user enters their paypal account info... How would i modify the forms or shortcode, that would allow this. Will this require custom javascripting on my part to toggle between forms? Or will it be handled automatically by s2members?

Thanks!